Which of the following is a characteristic of sodium ion?
A) It is a cation.
B) It is present primarily in the intracellular fluid.
C) It shifts out of the blood by active transport.
D) Diuretic drugs lead to high blood levels.
Answer: A) It is a cation.
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Which major type of muscle in humans has a primary function in movement?
A) smooth B) cardiac C) skeletal D) endothelial
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